an superior gemellus muscle

theoretical knowledge without practical experience; Literally, “swimming lessons on a tatami floor”

(mahjong) drawing the winning tile off the dead wall after declaring a 槓 (kan, “kong”), worth 1 翻 (han, “double”)

(linear algebra) upper triangular matrix

(grammar) Short for 上一段活用 (kami ichidan katsuyō): upper monograde conjugation

(grammar) an abbreviation for 上二段活用; upper dual grade conjugation

Alternative spelling of お手上げ: throwing up one's hands: giving up, quitting

(idiomatic, proverb) be quick on the uptake, understand the whole situation from just a few clues

(figuratively) a narrow world view based on limited experience

an ordinary person cannot understand the ambitions of a great man